Abstract: The circuit breaker includes a stationary contact member having a stationary contact, a movable contact member having at one end a movable contact contacting and separating from the stationary contact and having at the other end a rotational center, a case surrounding the stationary contact and the movable contact and defining a pressure accumulating space at one side of an arc generation position at which an electric arc is generated for temporarily storing a pressurized gas pressurized by the arc generated between the stationary and the movable contact upon a current interruption, and an exhaust port disposed at the other end of the arc generation position in the case so that the pressurized gas stored within the accumulation space upon the current interruption is exhausted by passing between the stationary contact and the movable contact.

Abstract: A current limiting device includes first and second contact members, each contact member having, at a first end, contacts defining a contact pair; a contacting pressure is applied to said contact pair; and a cylindrical insulator cylindrically surrounding the contacts when the contacts are closed. The device is arranged such that at least one of the first and second contact members is rotatably supported at a second end. Also, an electrical path is defined through which currents flow in substantial opposition to the first and second contact members and in opposite directions to each other. The first ends of the first and second contact members are positioned within the space defined by the cylindrical insulator in the closed contact state. The contact of at least one of the rotatably supported contact members is positioned outside of the space defined by the cylindrical insulator when the contacts are open.

Abstract: A switch having a molded article of which the entirety or a part is composed of an organic and inorganic complex composition is provided, wherein the base inside of the base of a box is composed of for example an organic and inorganic complex composition with the resin content at 15 to 70 wt % and the content of one or more inorganic compounds capable of dehydration at 150° C. or more at 80 to 30 wt %.

Abstract: A semiconductor wafer polishing endpoint detection system and a method therefor can detect a polishing endpoint accurately. A first polishing endpoint detecting means compares the value of the first averaged gradient data and the first endpoint judgment threshold value for making judgment of end of polishing of wafer when the value of the first averaged gradient data is greater than or equal to the first endpoint judgment threshold value continuously for a predetermined number of times, when the value of the first averaged gradient data is greater than or equal to the first endpoint judgment threshold value for a number of times greater than or equal to a given number of times in total after the absolute value of the first averaged gradient data becomes greater than or equal to a given value, or when a ratio that the value of the first averaged gradient data becomes greater than or equal to the first endpoint judgment threshold value is greater than or equal to a predetermined ratio.

Abstract: A switch containing a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc.

Abstract: A switch comprising a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc.

Abstract: A switch includes a moving element having a traveling contact at one end thereof, and a repelling element having a repelling contact at one end thereof and extending substantially parallel to the moving element, and the repelling contact capable of making and breaking contact with the traveling contact, and the switch further comprising a conductor connecting the repelling element to the side of a power source system, and the conductor including a first conductor portion positioned within the limits of the traveling contact and said repelling contact when said moving element and the repelling element are opened so as to be connected to the side of the power source system, and a second conductor portion connecting the first conductor portion to the repelling element at an end on the side opposed to the repelling contact.

Abstract: A switch includes a fixed contact having a first conductor portion connected to a terminal, a second conductor portion having a stationary contact, and a third conductor portion. The third conductor portion is disposed on the side of the other end of a moving contact to which a traveling contact is not mounted with respect to a position of the stationary contact, and on the side opposed to the terminal. The first conductor portion is disposed above a contact surface of contacts at a contact closing time, and is disposed below a contact surface of the traveling contact at a contact opening time. A position of the first conductor portion which can be surveyed from a surface of the traveling contact at an opening time of the contacts is coated with an insulator.

Abstract: A circuit breaker-includes: a casing having a base and a main cover secured to the base, the casing accommodating a circuit breaking mechanism; a recesses formed in one surface of the main cover, the opposite surface of which is on the side of the base, the recess being adapted to receive an auxiliary device of the circuit breaking mechanism; and an auxiliary cover mounted on the main cover in such a manner as to close the recess. The circuit breaker is automatically tripped when the auxiliary cover is opened, thus permitting installation of the auxiliary device thereon with high security.

Abstract: The current limiting circuit breaker comprises a circuit breaker (1A) and at least one current limiting unit (1B); the circuit breaker (1A) has load side terminals (12) and power-source-side or connection terminals (2a), and the current limiting unit (1B) is unitized to be simply connected to the circuit breaker (1A) or to another current limiting unit (1B) at their power source side terminals; the current limiting unit (1B) has current limiting connection terminals (25a) which ride on the circuit breaker connection terminals (2a) or power-source-side terminals (20a) of another current limiting unit (1B) for connection, to the circuit breaker (1A) or another current limiting unit (1B).

Abstract: In a circuit breaker of double break type, a first moving contact arm and a second moving contact arm are pivoted on a common pin shaft in a manner to move mechanically independent from each other and are electrically connected at the parts near the pivoted ends by a flexible conductor, such as a braided wires, and thereby stable and reliable contacts of the moving contacts on the stationary contacts are assured.

Abstract: In a twin-contact type current limiting apparatus in which two contacts are electrically connected in series with each other, each of movable contact arms (23a, 23b) is extended in substantially parallel with and along each of stationary contact arms (21a, 18a), thereby obtaining balanced electromagnetic repulsions when an excessive current flows.

Abstract: A circuit breaker with arc-extinguishing structure comprises a protrusion (5b) formed on an arc running surface (5a) of arc-runner (5) for smoothly moving an arc, and thus the arc is quickly extinguished.

Abstract: In a circuit breaker, an arc is produced between a pair of switchable contact members when these contact members are opened due to overcurrent. An arc extinguishing apparatus is employed to extinguish an arc produced between the opened contact members. The arc extinguishing apparatus includes a plurality of U-shaped metal arc extinguishing plates which are stacked, and a pair of insulating plates made of a synthetic resin. These insulating plates are mounted on both inside surfaces of leg portions of the extinguishing plates.

Abstract: A circuit breaker has current-limiting resistances (12) which are provided between a base (1) and a cover (18) and which limit a current to a tripping bimetal (11) for preventing fusing of the tripping bimetal (11).